Cutter chain



L. E. SIMMONS July 7, 1953- CUT-TER CHAIN l Original Filed Dec. 124, 1945 m W J 7] lenlsimmazzs'.

Patented July '7, 1953iY CUTTER CHAIN Leon E. Simmons, Claremont,- N. H., assigner to J oy Manufacturing Com Pennsylvania pany, a corporation of Continuation of application Serial No. 515,493,` December 24,1943. This application'March .19;

1948, Serial N; 15,931

's' claims. (C1. 26e-33) 1` This invention relates to cutter chains and more particularly to an improved cutter bit and cutter bit mounting and holding means for a mining machine cutter chain.

An object of the present vinvention is to provide an improved .cutter chain. Anotherobject t is to provide an improved mounting and holding means for a cutter bit. A further'object is to provide an improved cutter bit. Yet another object is to provide an improved. cutter. bit having improved gauging means and. holdingv means associated therewith. A further object is `to'provide an limproved cutter bit of the double pointed, reversible type having shoulders providing abutment surfaces formed on its cutting faces in a novel manner. A still further object is to provide an improved bit holderfor asmall, double pointed, reversible cutter bit. Other objects and advantages of the invention will, however, hereinafter more fully appear.

The present application is al continuation of my Ycopending application Serial No. 515,493, filed December 24, 1943, now abandoned.

1n the accompanying drawing there are shown for purposes of illustration two embodiments which the invention may assume in practice.`

In this drawing: v 'Fig l is a side elevational View of a portion of a cutter chain constructed in accordance with an illustrative embodiment of the invention.v

Fig. 2 is a cross sectional view taken substantially on line 2 2 of Fig. l, looking toward the front of the chain block.

Fig. 3 is a View in longitudinal vertical section taken substantially on line` 3-3 of Fig. 2.

. Fig. 4 is a horizontal sectional viewtaken substantially on line 4 -4 of Fig. 3.

Fig. 5 is a perspective View ofthe improvedl cutter bit shown in Fig. 3.

Fig. 6 isa perspective view of the'improved bit holder.

the path of travel of thechain, and anupstanding lug 'I is formedintegralwith the block in advance lofthe socket and has an inwardly and rearwardly sloping surface 8 extending along the forward wall of the socket in the man nershown in Fig. 3.5. There is a detachable holder 9 having a head IS andashank l|, the latterv being received in the block socket 6 in engagement with the rear socket wall. lThe holder has a recess l2 openingforwardly through itsv forward sideand .shaped to receive acutter bit |3 of afnovelf design. This cutter bit is preferably of generally .rhomboidal ,shape in side elevation and. hasV stepped frontl and rear cutting faces I4 and l5 whose portions are parallel to acomrn onplane and make up elongated diamond shapes terminating in cutting points4 i6 at the -oppositeextremities .of the bit on the Oppositesides of the bit body. The bit is preferably generally ,diamend shape in cross section vandlisV preferably cutfrom a piece vof bar stock of the desired material and shape, as disclosed ininy Patent No.

2,418,320. The cutting faces of the bitfgarevstepped in a novel manner; resulting` in overhanging shoulders il providingabutment surfaces 181 disposed at right angles to thecutting faces.. The.

inner vpart of the front Viacetoi the cutter Vbit,l when the latter is in cutting position onvthe chain block, rests against the inclined. ,surface 8, with the irontl abutment surface 118 50i-the bit engaging the outer surface of theppstanding lug 1,. as shown in Fig. 3, and the innerportion extends inwardly into the chain block .socket and into the holder recess l2. The rear surface-l of the cutter bit engages the inclinedrbottom .wall l 9 of the holder recess l2, with a shoulder 2@ on the holder overlying the abutment. surface I8 on the rearbit face. At the forward` side of the Fig. *7 is a vertical sectional View similar to Fig.

. 8, showing a modified form of the invention.

Fig. 8 is a perspective viewof thefront bit clamp shown inl Fig. 7. 'i

In both illustrative embodiments'of the invention, the improved cutter bit and bit supporting and holding means are shown associated with a. mining machine cutter chain comprising a se-` and strap links of various otherdesigns, if desired. In the embodiment of the invention shown in Figs. 1 to 6 inclusive, the chain block hasfa socket 6 disposed at substantiallyv right angles to chain block, a set'screw .2i-is threaded in an inwardly and downwardly inclined opening 22` in the chain block beneath the upstanding lugl,

and the inner end of the set screw engages an inclined surface 23 on the forwardside of lthe lower portion of the holder shank H. The sides 24 of the-:holder at theopposite sides of the-recess l2 engage the opposite sides ofthecutter .bit in the manner shown inFig. 4.- l:The holder `.shank is traversedby an opening 25 which enters the lower portion of the bit vreceiving;recess.- I2, and the inner inactive cuttingpoint I6:A of vthe cutter bit is received in thisjopening,M .Whenthe set'screw 2i is tightened, the holder Slis thrust rectilinearly inwardly within the block socket to clamp rmly the cutterbit againstythe inclined surface 8 on the chain .block. Llfhe vabutment surface i8 on the front face vof the cutter ,bit

:predeterminesy thebit gauge, while the abutrm'entv surface I8 on the .rear bit-wface cooperates with the shoulder 20 on the holder to lock the-cutter bit against longitudinal displacenrient4 frorn ,the

3 holderrec'ess. When the sei'scrw'A is loosened, the holder/may be moved outwardly -in the block socket a slight distance to disengage the shoulf der from the rear abutment surface IS on the l bit to enable the cutter bit to be readily released from the holder recess l2, and the bit may be reversed end for end and reinserted-inthe y'holder recess and again clamped-in cutting position onI Y the block simply by tightening the set screw. Accordingly, when one cuttingpoint ofgth'e bit becomes dull, a sharp pointy may be` presented to the Work, and the bit, due to its relatively inexpensive design, may be discarded when both points become dull.

The modified embodiment shown in Figs. 7

andV is-similar'tothat `shown in Fig. 3 withV the exception that'the-front face of the bit does not rest directly against the chain block, and thel Z9y the latter being similar to the cutter bit shown in Fig.v 5. Thefront holder member has a rearwardly facing inclined surface 39' extending into thevsock-et 28, and the front face of the cutter bit` rests against this surface with the shoulder at the front face of the bit resting againstthe outer endof the front holdermem- Y ber. A rear holder 3`I`, similar to the holder 9 shown in Fig'. 6, block socket and engaging the rear socket wall. Th'isfhold'er has af recess'f 32 opening forwardly through its front'face for receiving the cutter bit invthe manner shown in Fig. 7. When the setY 'screw'33', similar to the set screw 2i, is tightened', the'rear holder 3|, together with the front holder member 21., are thrust inwardly in the block'socket to eiect clamping-of the'bit with a wedgelik'e action in cutting position lon the ,i

chain block'. As'in the form of the invention shownIin Fig. 3, the rear holder has a shoulder which cooperates with the abutmentsurface I8 on the rear face of the cutter bit for locking the bit within the holder recess.

As a result of'this invention, an improved cutter chain is provided having improved bit mounting and holdinglrneans, whereby a cutter bit mayl be securedin cutting `position on a chain block in an improved? manner. It will further ,be evident that an improved cutter bit is provided Awhich hasnovel means for predetermining the bit gauge4 and for interlocking the bitV with vits holder means. Other uses Vand advantages of the inventionwill be clearly apparent to those. yskilled -in the art. '1

While vthere are-'in this Iapplication specically has its shank received in the.

described vtwo embodiments which the invention may assume in practice, it will be understood that vthese embodiments are disclosed for purposes ofillustration yand that the invention may be modified and embodied in various other forms Without departing from its spirit or the scope ofthe appended claims.

What I'claim as newl and desire to secure as LettersPatent is: 'l 1.v In a cutter chain, a chain blockhaving ia socket anda rearwardly facing inclined surface atthe forward wall of the socket, a reversible cixtterjbii'y having spaced cutting faces termi-'75 3981603 outer-esurfaceof the block, and a holder received insa-id blockf'so'cket and having a recess for receivingv the'inner portion of the cutter bit, the

inner wall -of the recess having a shoulder cooperatingwith theabutment surface of the shoulder' of the rear` bit face for locking the bit in said holder recess.

2; In a cutter chain, a chain block having a socket and a front upstanding abutment providinga rearwardly! facing inclined surface at the-forward wall ofIsaid-socketwith said surface extending" forwardly and outwardly from said socket, a reversible cutter bit Yhaving spaced cutting .faces terminating in cuttingv points at the' opposite extremities of thebit and having shoulders on its cutting faces providing abut- .mentfsurfaces the front face of said bit engaging said; inclined rearwardly facing surface with the; abutment surfaceof its front shoulder restsing. again'stfthe outer surface-of said front upstanding abutment exteriorly of said block, and Yazholder `received in said block socket and havrving'a recess for receiving the rinner portion of said cutter bit, the inner wall of said recess having ashoulderf cooperating with the abutment Vsurface-ofthe shoulder of the rear bitface for locking.l said bit in said holder recess, said holder as itis thrust inwardly in said socket firmly securing said front bit shoulder against said outer .surface of said upstanding abutment.r

A3..In a 'cutter chain, a chain block havingl a socket anda rearwardlyfacing inclined surface vratthev forwardwall of the socket, a reversible `cutter bit having a-body providing spaced cut.-

' ting faces terminating in cutting points at the opposite extremities of the bitand having shouldersfon its opposite faces` providing abutment surfaces projecting from said spaced bit faces, the front-.face -of saidbit engaging said inclined rearwardly facing surface with the .abutmentV abutment-surfaceof fthe shoulder on the rear bit face Afor locking said'bit to said holder, said holden as it is thrust. inwardly in said socket acting on vsaid rear abutment surface to hold Vsaidfro'rgit abutment surface tightly against the outersur'face of vsaid block' with the'bit body between said abutment surfaces placed under longitudinal tension.' Y Q l LEON SIMMONS.

'References-cited infinev nie of this `patent UNITEDrsTATEs PATENTS Number Name Date 1,078,082. Barton Nov. 11, 1913 1,926,047 Holmesng Sept. 12, 1933 V1,953,899y Stenger et al s Apr. 3, 1934 2,214,644l Stenger et al ,Sept..10, 1940 2,322,929A Fulke 1 June29, 1943 l FOREIGN PATENTS kNumbery Country DateV VGreatBritain Sept. 271, 199.3 

